Antifriction feed-chute for tube-machines



E. E. DAVlDSON.. ANTIFRICUON FEED CHUTE FOR TUBE MACHlNES.

APPLICATION FILED FEB. 1s. |917.

130,757,445. Patented June 3,1919;

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nUNITED sTaTns PATENT onnicu.

ELIAS E. DAVIDSON; OF AKRON, OHIO, ASSIGNOR TO THE B. F. GOODRICH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

AN TIFRICTION FEED-CHUTE FOR TUBE-MACHINES.

Specicaton of Letters Patent.

Patented J une 3, 1919.

Application filed February 16, 1917. Serial No. 148,943.

To all whom t may concern:

Be it known that I, ELIAS E. DAVIDSON, a' citizen of the United States, residin at Akron, in the county of Summit and tate of Ohio, have invented certain new and useful Improvements in Antifriction Feed- Chutes for Tube-Machines, of which the following is a specification.

This invention relates to machines for extruding rubber or other plastic substances which can be loaded into the feed hopper of the machine in the form of thick iieXible strips. Prior to my invention a plain hopper has been employed in rubber tube machines and its edges would engage the overhanging strip with considerable friction and frequently stop or obstruct the feed unless the attendant should assist the feed with his hands through a comparatively long period, during which he might profit ably be occupiedV otherwise, as in cutting the strips from a larger slab. The object of my invention is to facilitate the automatic feeding of the strip of raw gum through thehopper by the action of the feed-screw at its inner end, from the time that the forward end of said strip is first introduced to the screw, and this I accomplish by means of an improved arrangement 'and combination of anti-friction devices as hereinafter described.

Of the accompanying drawings,

Figure 1 represents a cross-section of a tube machine showing the anti-friction feed devices associated with the hopper. n

Fig. 2 is a side elevation of said parts with the machine barrel partly broken away to expose the feed-screw.

In the drawings, 10 is the usual jacketed barrel or cylinder having a feed-screw 11 therein driven by a shaft 12 which passes through a bearing in the rear head 13. 14 is the ordinary inclined feed-hopper, at the two ends of which I mount brackets 15, 16 supporting the two ends of a shaft 17 which is held fixed by set-screws 18. On said shaft is loosely mounted a horizontal roller 19 for supporting from below the overhanging rear portion 20 of the slab of raw material as indicated in Fig. 1, and thus relieving said strip from the friction formerly encountered on the righthand upper edge of the hopper as viewed in Fig. 1.

Further, in order to relieve any friction of the side edges of the strip 2O` against the hopper, I provide a pair of side rollers 21 loosely mounted on fixed shafts 22 which project-radially from hubs 23 secured by set-screws 24 to the shaft 17.

It will be evident that the particular details may be varied without departing from the spirit of my invention.

I claim:

1. In a tube machine, the combination lwith the hopper and feed-screw, of a pair of side rollers loosely mounted above said hopper for anti-frictionally engaging the edges of a strip of the raw material.

2. In a tube machine, the combination with the feed-screw and hopper, of antifriction devices at the upper mouth of Said hopper comprising a loosely-journaled horizontal roller for supporting from below the overhanging portion of a strip of the raw material, and a pair of side rollers loosely journaled -adjacent to the ends of said horizontal roller and extending' substantially atv right, angles thereto for guiding the edges of said strip. z l L In testimony whereof I have hereunto set my hand this 17thday of January, 1917.

ELIAS E. DAVIDSON.

Copies of this patent may be obtainedV for ve cents each, addressing the Commissioner of Patents; Washington, D. G. 

